linux-kernel - Re: [PATCH] make ipv4 multicast packets only get delivered to sockets that are joined to group

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Message-ID: <20060913202029.GA4666@ms2.inr.ac.ru>
Date:	Thu, 14 Sep 2006 00:20:29 +0400
From:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
To:	David Stevens <dlstevens@...ibm.com>
Cc:	Jeff Layton <jlayton@...chiereds.net>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	netdev-owner@...r.kernel.org
Subject: Re: [PATCH] make ipv4 multicast packets only get delivered to sockets	that are joined to group

Hello!

> IPv6 behaves the same way.

Actually, Linux IPv6 filters received multicasts, inet6_mc_check() does
this.

IPv4 does not. I remember that attempts to do this were made in the past
and failed, because some applications, related to multicast routing,
did expect to receive all the multicasts even though they did not join
any multicast addresses. So, it was left intact.

Alexey
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